VIG VR8810 7.4V Compatible Battery 3400mAh Li-ion

VIG VR8810 — 7.4V Li-ion Replacement Battery

This is a 7.4V, 3400mAh Li-ion replacement battery for the VIG VR8810 two-way radio. It slots into the VR8810 battery bay and connects to the radio's power rails using the original contact configuration. Capacity is drawn from verified product data — 25.16Wh total energy.

• VR8810 platform fit: The VR8810 runs a 7.4V nominal rail with a BMS handshake on first insertion. This pack matches that voltage requirement and carries the correct cell configuration to satisfy the radio's power management circuit without triggering a fault state.
• Bench tested on actual hardware: We cycled this pack through PTT transmit events and monitored the BMS response to sustained RF output draws. The protection circuit held stable across the draw curve — no overcurrent trip on repeated transmit bursts.
• First-insertion contact check: If the VR8810 charger dock shows a fault LED on first insertion, remove the pack immediately, wipe the gold contact strip with a dry cloth, and reseat firmly. The dock requires a clean contact cycle to complete the BMS handshake before it will begin charging.

VR8810 bar indicator showing one fewer bar than expected on a new pack

New Li-ion cells ship at storage voltage — typically around 3.7V per cell, not the 4.2V per cell that represents a full charge. The VR8810 reads voltage thresholds to drive its bar indicator, so a pack straight out of the box will display fewer bars than expected. This is not a cell defect. Run the pack through one full charge cycle on the dock before reading the bar count as accurate.

VR8810 drops to reduced TX power mid-shift on a fresh battery

Under sustained RF output — long transmit windows or repeated back-to-back PTT presses — the radio's power amplifier draws hard against the pack. If cell impedance is higher than the radio expects, terminal voltage sags below the threshold that sustains full TX power, and the radio steps down output automatically. This is a voltage sag event, not a capacity issue. Let the pack rest for two minutes off the radio, then check resting voltage — it should recover to 7.2V or above before the next shift.